工作场所空气中氯丙烯测定的溶剂解吸气相色谱法

Solvent desorption gas chromatography for determination of allyl chloride in workplace atmosphere

目的 建立工作场所空气中氯丙烯测定的溶剂解吸毛细管柱气相色谱方法.方法 活性炭管吸附空气中氯丙烯,用二氯甲烷解吸后毛细管柱气相色谱分离、火焰离子化检测器（FID）测定.结果 氯丙烯浓度在0～200 μg/ml范围内线性关系良好,线性方程为y=1.27x-0.22,相关系数r=0.999 8.检出限为0.20 μg/mL,若采集7.5 L空气样品,则最低检出浓度为0.03 mg/m^3.对高、中、低三个浓度水平重复测定的日间、日内相对标准偏差（RSD）分别为2.7％～4.8％;平均采样效率100.0％;总体解吸效率为94.4％;穿透容量＞0.59 mg（100 mg活性炭）.结论 该方法适用于工作场所空气中氯丙烯浓度的测定.

Objective To establish a method for determination of allyl chloride in the workplace atmosphere by solvent desorption-capillary column gas chromatography.Methods Allyl chloride in the atmosphere was adsorbed by activated charcoal tubes and desorbed using dichloromethane,and was then separated by capillary column gas chromatography and determined by flame ionization detector.Results The concentration of allyl chloride showed a good linear relationship within the range of 0～200 μg/ml.The linear regression equation was y=1.27x-0.22 with the correlation coefficient r being 0.999 8.The limit of detection was 0.20 μg/mL.If 7.5 L of air was sampled,the minimum detectable concentration was 0.03 mg/m^3.The intra-day and inter-day relative standard deviations （RSD） of repetitive measurement at the high,middle,and low concentration levels were 2.7%～4.8%.The average sampling efficiency was 100%.The overall desorption efficiency was 94.4%.The breakthrough volume was over 0.59 mg （100 mg activated charcoal）.Conclusion The method applies to the determination of allyl chloride in the workplace atmosphere.